Blog

Notes on building an Android scanner that never touches the network — the engineering, the privacy reasoning, and what we found when we checked what "offline" scanners actually do.

• September 5, 2026

  How does a scanner flatten a curved book page without the cloud?

  A technical look at book-page dewarp: why bound pages photograph curved, the classical geometry fix, and why Talpatra Scan runs a UVDoc-style neural mesh model on-device instead of a server.

  engineeringproduct
• September 5, 2026

  Is Talpatra Scan really offline? Here's how to check for yourself

  Talpatra Scan never requests Android's INTERNET permission, enforced at build time. Here's what that means and how to verify it against the APK yourself.

  privacyengineering
• September 5, 2026

  What 'offline' document scanner apps actually do

  We checked whether Adobe Scan, Kaagaz, and Doc Scanner really work offline, what they cost, and whether any has real book dewarp. Sourced, re-verified 2026-09-05.

  privacycomparison